Cyberduck · Cyberduck · CVE-2025-41256
Name of the Vulnerable Software and Affected Versions:
Cyberduck versions through 9.1.6
Mountain Duck versions through 4.17.5
Description:
The issue is related to improper handling of TLS certificate pinning for untrusted certificates, such as self-signed certificates, in Cyberduck and Mountain Duck. The certificate fingerprint is stored as SHA-1, which is considered weak.
Recommendations:
For Cyberduck versions through 9.1.6, consider updating to a version that properly handles TLS certificate pinning.
For Mountain Duck versions through 4.17.5, consider updating to a version that properly handles TLS certificate pinning.
As a temporary workaround, consider disabling the use of SHA-1 for certificate fingerprints in both Cyberduck and Mountain Duck until a patch is available.